They will not increase execution limit because I'm on shared server. But they just killed all the processes and all is working fine now. They also said my script has somehow over.... something (not sure if I understand the word in my language too ) and that I need to care that won't happen again. I assume one add-on is a bit heavy for my forum. Again need to find other simplier solution.
I've also deleted many user groups as I really don't need them (just to show a specific banner to user it's pointless to use).